These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
Trump calls Turkeyâs Erdogan to congratulate him on contested vote. 1  According to Turkish officials, President Trumpâs comments differed in tone from those of the State Department, which urged Turkey to respect the rights of its citizens and noted election irregularities observed during the referendum.